Physical performance is assessed using a modified Bruce-protocol. Arterial elasticity is measured by pulse-wave analysis of the radial artery. Endothelium-dependent vasodilation is assessed sonographically by flow-mediated vasodilation. 24h-ABP monitoring is performed using Spacelabs 90207 monitors. The follow-up BP and vascular measurements of the training group are conducted within 2 days after the last training session.